That's when Chanos — the short seller famous for his research on Enron and Tyco — revealed SolarCity is one of his new big short positions.

Chanos went on to compare the solar company to subprime housing.

"You basically lease the panels from SolarCity and they collect the lease payments. So in effect, if you put on the panels, you have a second mortgage on your home because you hope it's an asset, but in many cases, it turns into a liability," Chanos said.

"First I've ever heard of the guy," Rive said in telephone call with Business Insider shortly after 3 p.m. Eastern Time Friday.

He added that Chanos is "intentionally misleading people [by] saying it's subprime."

Rive called Chanos' analogy "dramatically wrong," noting that the average FICO score for their customers is 740 and the lowest score is 650. Anything below 640 is considered subprime.

"[Chanos is] wrong. He knows this. Our FICO score is public when we do securitizations ... He's intentionally saying this to add more pressure to the stock so he can make money."

He later added that Chanos "just doesn't understand the business."

Rive went on to explain that SolarCity has a "very straightforward" business model and that its products help customers save money.

He said, "You are the homeowner. Today you use energy. You pay for that energy from a utility. We provide homeowners an additional source of energy so they have another choice."

SolarCity has four different offerings for its panels. There is an option to purchase the system upfront in full, which can cost $15,000 to $20,000. Then there's a lease where SolarCity owns the panel system, but the customer pays for the power that it provides every month.

There is no investment required for customers who lease. The company installs the panels and customers sign a 20-year contract so SolarCity can finance the systems. Customers also pay a fixed price for 20 years. That price guarantee proves "full transparency," according to Rive.

He said SolarCity helps customers save 15% to 20% on their monthly utility bills.

It charges $0.15 per kilowatt hour in California, which is cheaper than the $0.20 per kilowatt hour a utility would charge. Rive added that SolarCity is also cheaper than its competitors, who charge "maybe 16 or 17 cents per kilowatt hour."

Jim Chanos. Bloomberg TV, screenshot One of Chanos' arguments is that solar prices have come down and those people who have signed these 20-year contracts are paying an "above market" price.

Chanos said on CNBC: "The reason being is that the prices that they have contracted retail customers out for are now relatively uneconomic in the newer world of solar, where prices are dropping. And I would just like to say ... I think solar is a transformational industry and it's going to be a great thing. Part of it is costs keep coming down — that's a problem if you're SolarCity and your customers are paying you these above-market prices and you hope to sell more and more systems."

It's certainly possible that a newer customer to SolarCity could get a lower rate than those who signed a contract three or four years ago. But the company argues that customers are still going to have a lower rate than the traditional utility no matter what.